Speed-indicator



J. M. BENCKERT.

Governor and Speed lndicator.

No. 18,727. Patented Dec. 1, 1857.

N. PETERS, PhulmLflhograpl-lev. Wasllmgicm. D. c.

UNITED STATES PATENT OFFILE.

JAMES M. BENOKERT, OF PHILADELPHIA, PENNSYLVANIA.

SPEED-INDICATOR;

Specification of Letters Patent No. 18,727, dated December 1, 1857.

To all whom it may concern:

Be it known that I, J. M. BENCKERT, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a new and useful implement or device which may be used both as a speed indicator and as a governor for machinery; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which Figure 1 is a side view of my improvement. Fig. 2, is a vertical section of do taken in the line, w, m, Fig. 1. Fig. 3, is a detached view of the geared cam, through which motion is communicated to the spindle from the weighted levers or arms.

Similar letters of reference indicate corresponding parts in the several figures.

This invention consists in a peculiar arrangement of a double threaded geared cam, geared segments, and swivel arm, as hereinafter set forth, for the purpose of indicating and regulating the speed of mechanism.

To enable those skilled in the art to fully understand and construct my invention I will proceed to describe it.

A represents a tube or hollow shaft which is allowed to rotate freely in uprights, a, a, or it may be placed in proper bearings arranged in any convenient way.

B is a pulley which is secured on the shaft A, and C, is a plate which is also secured upon said shaft near one end. The plate, 0, projects at equal distances from opposite sides of the shaft, A, and to each end of the plate, C, the inner ends of two arms, D, are pivoted, the extreme inner ends of said arms being connected by teeth; or, in other words, having teeth formed on them which gear into each other as shown clearly ata, in Fig. l, and the outer ends having weights (1, attached.

To one of the arms D of each pair a toothed segment, E, is attached, and these segments gear into teeth, I), formed on a cylindrical cam, F, which is placed loosely on the shaft A. The construction of the cam is plainly shown in Fig. 8. It is simply a short tube having the teeth, Z), on one end, and having its opposite end provided with two oblique terminations, c, 0, the edges or face sides of which may be described as being curved so as to form parts of the thread of a screw, one being in a reverse position to the other. The two pairs of arms, D, are connected by springs D.

To the plate, C, two pins, d, d, are attached. These pins are placed at opposite sides of the tube or shaft A, and in line with its center. G is a swivel arm which has holes through near each end, through which holes the pins, d, 03, pass. WVithin the hollow shaft A a tube H is placed, the outer end of which has a screw, 6, fitted in it, said screw being provided with a shoulder and a square head, f. The screw, 6, passes through the center of the swivel arm G, which is allowed to rotate freely upon it.

Within the tube H a spiral groove is cut or formed, and this groove receives a thread on a spindle I which is fitted within the tube H see Fig. 2. The outer end of the spindle I, has an index J attached to it, said index traversing over .a properly graduated dialplate K. The square head, f, of the screw, 6, is fitted in a recess made in the upper end of a spring L, and the head, f, may be connected to the rod of a throttle valve or to the stem of a water-wheel gate. The pulley B is driven by a belt, g. It will be seen that as the pulley B rotates, the plate C, with the arms D, also rotate; and when the centrifugal force generated by the revolution of the arms is sufficiently great to overcome the power of the springs D, the arms D will be distended and the cam F will move the swivel arm G outward, in the direction indicated by arrow 1, Fig. 2, and also the tube H, will as it is moved rotate the spindle I in consequence of the screw connection previously explained. IVhen the centrifugal force decreases, the springs D draw the arms D toward each other, and the cam F is rotated in the opposite direction, and in consequence of these movements the index J will be turned and will point out on the dial plate the number of revolutions of the pulley B, or that of any shaft of the machinery to which the device is attached. It will also be seen that as the screw, 6, is moved it may operate a throttle-valve round or the stem of a waterwheel gate so as to control and regulate speed of the machinery.

This device may be constructed at a reasonable cost and is not liable to get out of order or repair. It will if properly made point out accurately the speed of machinery and also regulate the speed as desired.

Another advantage of my improvement is that it may be made to occupy a thinner space than any other governor with which The arrangement of the double threaded -I am acquainted. cam F, segments E, and swivel arm G, as 10 I distinctly disclaim the employment of and for the purposes herein set forth.

Weighted arms assisted by springs in gover- 5 nors or speed indicators, for I am Well aware JAMES BENGKERT' that they are old. But Witnesses:

What I claim as my invention, and desire ROBERT T. CARTER, to secure by. Letters-Patent, is: WM. J. SWAIN. 

